/**
 * MCP Authorization Protocol Version Support
 *
 * This module defines protocol version enumerations and configuration
 * to support both the legacy (pre-2025-11-25) and updated (2025-11-25)
 * MCP authorization specifications.
 */
/**
 * Supported MCP authorization protocol versions
 */
export declare enum ProtocolVersion {
    /**
     * Original MCP OAuth specification
     * - Optional PKCE (S256 or plain)
     * - DCR-based client registration (RFC 7591)
     * - Standard OAuth 2.0/2.1 flows
     */
    PRE_2025_11_25 = "pre-2025-11-25",
    /**
     * MCP 2025-11-25 specification
     * - Required S256 PKCE
     * - Client ID Metadata Documents (HTTPS URLs as client IDs)
     * - Resource parameter (RFC 8707)
     * - Token audience validation
     * - Scope selection strategy
     * - Step-up authorization
     * - Private Key JWT authentication
     */
    MCP_2025_11_25 = "2025-11-25"
}
/**
 * Protocol-specific feature configuration
 *
 * This interface defines which features are enabled/required
 * for a given protocol version.
 */
export interface ProtocolConfig {
    /**
     * The protocol version being used
     */
    version: ProtocolVersion;
    /**
     * Enforce S256 PKCE code challenge method
     * - Pre-2025-11-25: false (S256 or plain allowed)
     * - MCP 2025-11-25: true (S256 required)
     */
    enforceS256PKCE: boolean;
    /**
     * Require resource parameter in authorization/token requests (RFC 8707)
     * - Pre-2025-11-25: false
     * - MCP 2025-11-25: true
     */
    requireResourceParameter: boolean;
    /**
     * Enforce token audience validation
     * - Pre-2025-11-25: false
     * - MCP 2025-11-25: true
     */
    enforceTokenAudience: boolean;
    /**
     * Support Client ID Metadata Documents
     * - Pre-2025-11-25: false
     * - MCP 2025-11-25: true
     */
    supportClientIDMetadata: boolean;
    /**
     * Support step-up authorization (insufficient_scope handling)
     * - Pre-2025-11-25: false
     * - MCP 2025-11-25: true
     */
    supportStepUpAuth: boolean;
    /**
     * Require private_key_jwt authentication method support
     * - Pre-2025-11-25: false
     * - MCP 2025-11-25: true (as an option)
     */
    requirePrivateKeyJWT: boolean;
}
/**
 * Get default protocol configuration for a given version
 */
export declare function getProtocolConfig(version: ProtocolVersion): ProtocolConfig;
/**
 * Check if a protocol version supports a specific feature
 */
export declare function supportsFeature(version: ProtocolVersion, feature: keyof Omit<ProtocolConfig, 'version'>): boolean;
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